There are pretty good ones that are pretty good for almost everything like the Antec TruePower. (~ $100)

If you look for a 0dB PSU there's Antec Phantom. (In fact, it's the same as a TruePower if we're not talking about noise level)

A pretty good overall quality PSU could be a Fortron / FSP. There's the $60 Blue Storm I've looked at recently. It's efficient, under 23dB of noise (Your HDD is noisier), 380w and cheaper than TruePower.

If you have a generic case and would like to improve cooling, there's the Antec Sonata II ($120) which is coming with a nice Antec SmartPower 2 450W power supply, rack-mounted drives, 120mm fan.

Just advices. It depends on how much you're ready to pay and what you want. Tell what I asked for first, it's going to be more helpful.

when you get a quality brand PSU, you don't have to worry about high wattage (unless you're going to run SLI/CrossFire). in other words a 330w PSU would be fine if it wasn't a rubbish brand.

the wattage rating on a cheap PSU is a maximum under ideal conditons (a dust free, very cool room). also the amperage will be mostly on the 3 and 5 volt lines and not on the 12V line that modern systems need.

if you want to get a high wattage PSU, be my guest.... but most systems will not require any more than 350w